Bitter divorce: Mary J. Blige accuses ex of spending $420,000 on new girlfriend... while claiming it was business expenses

Mary J. Blige is accusing her estranged husband of spending hundreds of thousands of dollars on his new girlfriend while passing the expenditure off as business expenses.

The singer, 46, filed for divorce last year from Martin 'Kendu' Isaacs, who was also her manager.

The latest allegations come in new documents filed with the court as Blige fights off demands from her ex for $110,000 a month in spousal support, TMZ reported Thursday.

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Court battle: Mary J. Blige is accusing her estranged husband Martin 'Kendu' Isaacs of spending hundreds of thousands of dollars on his new girlfriend while passing the expenditure off as business expenses. She filed for divorce last year. They're pictured in 2014

Blige claims Isaacs took more than $420,000 and used it for what he called 'travel charges,' as she insists the money was not spent on business-related activities or in activities that involved her.

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Previously TMZ had reported that Blige was 'outraged' over payment requests from her husband following their split, stating: 'I am not responsible for supporting [Martin's] parents and his children from another relationship which he lists as ongoing monthly expenses.'

In court papers, the recording artist says their estate is 'underwater' to the tune of $10 million and Isaacs contributes nothing to expenses and upkeep.

Messy divorce: Blige, pictured performing in Melbourne, Australia, last week, is battling her ex over his demands for $110,000 a month in spousal support

Earlier this year, Blige revealed in a radio interview that she filed for divorce after realizing Isaacs didn't want her anymore.

'You start to realize that this man doesn't want you and he's just gone all the time and you're by yourself in the relationship,' she told Angie Martinez on Power 105.1.

The No More Drama hitmaker went on: 'When you realize you're by yourself and you're just suffering through it, now it's time to do some investigating. When I got the full proof, I didn't have to investigate it. It just showed up.'

Opened up: Blige, 46, spoke about the end of her marriage while on The Angie Martinez Show in March, explaining she just realized her husband of 12 years didn't want her anymore